American cars just don't have any market presence here. German people's oppinion of America cars is still: high fuel consumption, unreliable, bad quality, interiors that fall apart, good in straight line but every corner is potential death, leaf springs. To be fair, that was true for the longest time, too. Today's cars are probably very different, but that image is just etched into people's minds.
My only real own experience with American cars is a Jeep Cherokee I used to own. Needed a torque converter and Chrysler Spain (that was on Tenerife) couldn't get it because the car I had was some sort of special edition only sold in Switzerland, IIRC, and they didn't have the microfiche for that specific variant. Yes, that was in a time where computers and electronic parts catalogues were a thing. They were too stupid to just lift the car and notice that the car had a TH400 transmission, which is like the most common transmission around, and deduce what converter I needed from there.
Several people I know had had similar experiences with American cars, and of yourse next time you are looking for a car you remember that and buy something not American.
Also, Audis aren't trash. You might just have gotten a lemon. BMWs nowadays are shit, that is known.